Electric fan



FIG. 1 is a perspective view of an electric fan showing my new design;

FIG. 2 is a front elevation thereof;

FIG. 3 is a rear elevation thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a right side elevation thereof; and

FIG. 7 is a left side elevation thereof. 

The ornamental design for an electric fan, substantially as shown. 